.px2rem(@name,@px){
    @{name}:@px / 75 * 1rem;
}
html,body{
    width: 100%;
    height: 100%;
    background-color: #191919;
}
.sous-header{
    .px2rem(height,80);
    width: 90%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #252525;
    .header-left,.header-right{
        width: 15%;
        text-align: center;
        img{
            .px2rem(width,30);
            .px2rem(height,30);
        }
    }
    .header-center{
        width: 70%;
        input{
            border: none;
            outline: none;
            background-color: #191919;
            width: 100%;
            .px2rem(height,40);
            color: #fff;
            border-left: 4px solid #2a2a2a; 
        }
    }
}